[Security Solution][Detections]Fixes Rule Management Cypress Tests (#…

…96505) (#96521)

## Summary
Fixes two cypress tests:

> Deleting prebuilt rules "before each" hook for "Does not allow to delete one rule when more than one is selected"
#68607

This one is more of a drive around the pot-hole fix as we were waiting for the Alerts Table to load when we really didn't need to. Removed unnecessary check.
<p align="center">
  <img width="500" src="https://user-images.githubusercontent.com/2946766/113932347-b9ab9480-97b0-11eb-8e07-5f3e0c4b6c78.png" />
</p>

> Alerts rules, prebuilt rules Loads prebuilt rules
#71300

This one was fixed with a `.pipe()` and `.should('not.be.visible')` to ensure the click was successful. Also removed unnecessary check on the Alerts Table loading that was present here as well too..
<p align="center">
  <img width="500" src="https://user-images.githubusercontent.com/2946766/113932285-ac8ea580-97b0-11eb-90e1-618c510d33a7.png" />
</p>

Co-authored-by: Garrett Spong <spong@users.noreply.github.com>

x-pack/plugins/security_solution/cypress/integration/detection_rules/prebuilt_rules.spec.ts

@@ -14,11 +14,7 @@ import {
   SHOWING_RULES_TEXT,
 } from '../../screens/alerts_detection_rules';
 
-import {
-  goToManageAlertsDetectionRules,
-  waitForAlertsIndexToBeCreated,
-  waitForAlertsPanelToBeLoaded,
-} from '../../tasks/alerts';
+import { goToManageAlertsDetectionRules, waitForAlertsIndexToBeCreated } from '../../tasks/alerts';
 import {
   changeRowsPerPageTo300,
   deleteFirstRule,
@@ -47,7 +43,6 @@ describe('Alerts rules, prebuilt rules', () => {
     const expectedElasticRulesBtnText = `Elastic rules (${expectedNumberOfRules})`;
 
     loginAndWaitForPageWithoutDateRange(DETECTIONS_URL);
-    waitForAlertsPanelToBeLoaded();
     waitForAlertsIndexToBeCreated();
     goToManageAlertsDetectionRules();
     waitForRulesTableToBeLoaded();
@@ -79,7 +74,6 @@ describe('Deleting prebuilt rules', () => {
 
     cleanKibana();
     loginAndWaitForPageWithoutDateRange(DETECTIONS_URL);
-    waitForAlertsPanelToBeLoaded();
     waitForAlertsIndexToBeCreated();
     goToManageAlertsDetectionRules();
     waitForRulesTableToBeLoaded();

x-pack/plugins/security_solution/cypress/tasks/alerts_detection_rules.ts

@@ -191,7 +191,10 @@ export const resetAllRulesIdleModalTimeout = () => {
 
 export const changeRowsPerPageTo = (rowsCount: number) => {
   cy.get(PAGINATION_POPOVER_BTN).click({ force: true });
-  cy.get(rowsPerPageSelector(rowsCount)).click();
+  cy.get(rowsPerPageSelector(rowsCount))
+    .pipe(($el) => $el.trigger('click'))
+    .should('not.be.visible');
+
   waitForRulesTableToBeRefreshed();
 };